Samsung DV520 Troubleshooting guide

Volume 7, Issue 7
Home Appliances Newsletter
July, 2012
Samsung Electronics America
Samsung Tech Talk
Your source for service information
New 2012 Smart Washer/Dryer Videos on SPSN
Inside this issue:
Jeff Brutman
New 2012 Smart
Washer/Dryer Videos on SPSN
1
No Power Problem
on the DV 520 Dryers
2
Quick Diagnoses for 5
a Defrost Circuit
Failure
2012 RTC Home
Appliance Training
2012 Appliance
Training Now On
Line on Plus 1!
7
9
Senior Staff, Publications
SPSN, Samsung’s Product Support Network, has added six new Smart Washer/Smart
Dryer videos to the list of its online offerings. Covering the WF455, WF457, and DV457,
these videos demonstrate, in an easy to understand, step by step fashion, such topics as
connecting the WF455’s Smart Control in AP or WPS mode and using the WF457 Smart
Control feature with the Outdoor setting.
While these videos are designed for consumers, they can provide you with substantial insight into how to implement and use these functions. In addition, they give you a resource
that you can direct customers to for easy to understand but detailed explanations of how to
set up and use the Smart Control functions.
The six videos are listed below by product, with live links to each video in the right hand column.
Product
Video
Link to Web Page
WF455
Using Smart Control Feature with Outdoor Setting Smart Washer
http://support-us.samsung.com/spsn/howto.jsp?
channelId=1100&scheduleId=8434
WF455
Connecting Smart Control in
WPS Mode: Indoor Setting Smart Washer
http://support-us.samsung.com/spsn/howto.jsp?
channelId=1100&scheduleId=8435
WF455
Connecting Smart Control in
AP Mode: Indoor Setting Smart Washer
http://support-us.samsung.com/spsn/howto.jsp?
channelId=1100&scheduleId=8436
WF457
Using Smart Control Feature with Outdoor Setting Smart Washer
http://support-us.samsung.com/spsn/howto.jsp?
channelId=1100&scheduleId=8432
WF457
Using Smart Control Feature with Indoor Setting Smart Washer
http://support-us.samsung.com/spsn/howto.jsp?
channelId=1100&scheduleId=8433
DV457
Using Smart Control Feature with Indoor Setting Smart Dryer
http://support-us.samsung.com/spsn/howto.jsp?
channelId=1100&scheduleId=8438
View them today.
Volume 7, Issue 7
Home Appliances Newsletter
Samsung Tech Talk
No Power Problem on DV520 Dryers
Wes Sirois
Assistant Manager, HA Product Support
If you have replaced the Main PCB on a DV520 and the unit does not turn on, check the RY5 connector. You can connect the RY5 connector in two ways. If the connector is connected the wrong way, the control panel will not activate.
The failure to turn on occurs after you
have replaced the Main PCB.
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Volume 7, Issue 7
Home Appliances Newsletter
No Power Problem on DV520 Dryers
continued
Correct Main PCB Installation
Incorrect Main PCB Installation
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Samsung Tech Talk
Volume 7, Issue 7
Home Appliances Newsletter
Samsung Tech Talk
No Power Problem on DV520 Dryers
continued
When you connect the RY5 connector correctly, the black wire is on the left side of the relay and the brown wire is on
the right side. If you get no power, first verify that power is being supplied to the unit. Then, check the RY5 connection
to make sure power is being supplied to the Main PCB. If power is being supplied, check the CN2 connector. If you get
normal readings, check the sub PCB. If these readings are not normal, verify that the RY5 connector is connected
properly. If the connections are correct, change the Main PCB.
Please Send Us Your Comments!
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like us to write about, LET US KNOW!
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training@sea.samsung.com
Page 4
Volume 7, Issue 7
Home Appliances Newsletter
Samsung Tech Talk
Quick Diagnoses for a Defrost Circuit Failure
Steve Polzin
HA Tech Support Specialist
Samsung refrigerators use the adaptive defrost method to achieve frost free operation. Adaptive defrost simply means
the refrigerator will defrost based upon need up to three times in a 24 hour period for the R room and 2 times for the F
room. The main PCB calculates compressor run time, door cycles, ambient temperatures, and the length of previous
defrost cycles, and then chooses the optimum number of defrosts based on that data. Adaptive defrost provides the
greatest energy efficiency and is standard with most refrigerators produced today.
Accurately diagnosing a defrost failure in any Samsung refrigerator is a relatively easy process. The defrost circuits for
the refrigerator and freezer compartment are virtually the same. If you follow the procedure and use the diagram provided as a reference, you will be able to apply the diagnostic procedure to all models. Once your diagnostic procedure
has led you to a potential defrost failure, we recommend you remove the evaporator cover so you can visually confirm
your findings, and then make the appropriate measurements. Always be sure to make a distinction between a frozen
defrost drain (clear ice extending down to the drain trough) or an evaporator that is not defrosting (heavy frost from top
to bottom of the evaporator) before diagnosing defrost operation failure. Clear Ice indicates the defrost circuit is working but not draining. Also, make sure you take your measurements before manually defrosting the evaporator coil as
the defrost sensor needs to remain frozen for reliable testing.
Diagnoses and Repair
With the evaporator cover removed, locate the three Molex connectors present
on all models. The wire colors may vary, but the placement will be the same on
all models.
The top plug is the thermal fuse or bimetal depending on the model. Every defrost circuit will incorporate one or the other and both parts serve the same purpose and are wired in series with the defrost heater. This thermal protection is
necessary to provide a thermal break for the heater circuit in the event the relay
on the main PCB fails in the closed position. The thermal fuse/ bimetal will open
the heater circuit if the evaporator temperature rises to approximately 130 degrees F. The thermal fuse or bimetal should always be in the closed position. If you find that it is open, replace the
failed component and also replace the defrost thermistor. The defrost thermistor should be replaced because the sensor is feeding back incorrect information causing the defrost heater to stay on too long.
The middle plug is the defrost heater (brown wires). The range of resistance
when you check the refrigerator defrost heater will vary between 80-150 ohms
depending on the size and design of the cooling system. The lower the resistance, the hotter the heater. Expect to see 80 to 100 ohms for SXS units and
100 to 150 for French door and bottom mount models. When checking freezer
defrost heaters, expect to see 45 to 65 ohms of resistance.
The bottom plug is the thermistor (usually yellow wires) and should be measured before manually defrosting. This will allow you to see the same resistance
the micro processor is seeing when the unit goes into defrost. An average
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Volume 7, Issue 7
Home Appliances Newsletter
Samsung Tech Talk
Quick Diagnoses for a Defrost Circuit Failure
continued
reading should be between 20k and 40k ohms which converts to a temp range between +14 and -14 degrees, indicating
a good sensor.
Accurately evaluate your measurements. If the thermal fuse or bimetal and heater check good, your problem will be either the sensor or the main PCB. If the sensor checks good, your diagnostic procedure indicates main PCB failure. Replace the main and the sensor. If the sensor checks bad, just replace the sensor.
When testing these sensors, it is important that they be tested in circuit. We also recommend you replace the defrost
sensor when ever servicing all defrost failures regardless of the diagnosis. For example, if you find an open thermal fuse,
also replace the sensor; if you find an open heater, also replace the sensor, etc.
Why Would You Do This?
Defrost sensors are mounted on the evaporator coil and expand and contact as temperatures fluctuate between -20 during cooling mode and 50/60 in defrost. Also, they are always wet. Moisture can infiltrate the sensor leading to intermittent
operation and inconsistent test results. Therefore, it always a good service practice to replace it during the repair of a
defrost circuit failure.
Samsung Electronics America
85 Challenger Road
Ridgefield Park, NJ 07660
Phone: 201-229-4251
The information in this bulletin is published for experienced repair technicians
only and is not intended for use by the public. It does not contain warnings to
advise non-technical individuals of possible dangers in attempting to service a
product. Only experienced professional technicians should repair products
powered by electricity. Any attempt to service or repair the product or products
dealt with in this information by anyone else could result in serious injury or
death. Information provided in this bulletin is subject to change or update without notice.
Page 6
Volume 7, Issue 7
Home Appliances Newsletter
Samsung Tech Talk
2012 RTC
Home Appliance
Training
Samsung HA Training 2012
Being held at one of our Regional Training Centers!
For 2012, Samsung introduces a new way of training. To help you with
your demanding schedule, updated training on new 2012 products will
be two days long. To be eligible to attend the two day training session,
techs must have attended and successfully completed 2011 HA product
training in one of our training centers.
Samsung will still hold 3 day Basic classes quarterly. These classes are
intended for new techs who have never attended a Samsung training, or
for techs who need extra help to improve their skills.
For a limited time, we will be holding classes in our Los Angeles
and Atlanta area training centers. Act now as these classes will not
be held regularly at this location!
Attend the in-depth, hands-on 2 day Update or 3 day Basic training at
one of our RTCs!
You can reserve your seat in training by emailing training@sea.samsung.com.
Additionally, Home Appliance training is available on-demand 24/7 at https://my.plus1solutions.net/clientPortals/
samsung/
Training Schedule
Date
July 10-12, 2012
City
Little Ferry, NJ
ME/ASC 2012 3 day Basic Training
July 31, 2012
Jacksonville, FL
HA Training at NESDA Convention
July 31-August 2, 2012
Bensenville, IL
ME/ASC 2012 3 day Basic Training
August 14-15, 2012
Little Ferry, NJ
ME/ASC 2012 2 day Update Training—Session 1
August 16-17, 2012
Little Ferry, NJ
ME/ASC 2012 2 day Update Training—Session 2
August 21-22, 2012
Austell, GA
ME/ASC 2012 2 day Update Training—Session 1
Class Full!
Page 7
Comments
Volume 7, Issue 7
Home Appliances Newsletter
Samsung Tech Talk
2012 RTC Home Appliance Training
continued
Date
City
Comments
August 23-24, 2012
Austell, GA
ME/ASC 2012 2 day Update Training—Session 2
Class Full!
August 28-29, 2012
Rancho Dominquez, CA
ME/ASC 2012 2 day Update Training—Session 1
August 30-31, 2012
Rancho Dominquez, CA
ME/ASC 2012 2 day Update Training—Session 2
August 28-29, 2012
Bensenville, IL
ME/ASC 2012 2 day Update Training—Session 1
August 30-31, 2012
Bensenville, IL
ME/ASC 2012 2 day Update Training—Session 2
Page 8
Volume 7, Issue 7
Home Appliances Newsletter
Samsung Tech Talk
2012 Home Appliance Training Now On-Line on Plus 1!
Jim Foster
Manager, Training /Publications
Samsung is pleased to announce that 2012 Appliance Certification courses are now online. Keep your skills up–to-date
on our latest models! Go on line and take a course today.
Click here to access Plus 1: https://my.plus1solutions.net/clientPortals/samsung/
The 2012 HA on-line certification training is divided into seven courses:
2012 Samsung Refrigerator Troubleshooting Guide (Video - Released 4.30.2012)
2012 Samsung Refrigerator with New Icemaker Training (Video - Released 4.30.2012)
2012 Samsung Wi-Fi Dryer Training (Video - Released 4.30.2012)
2012 Samsung Wi-Fi Washer Training (Video - Released 4.30.2012)
2012 Samsung Laundry Troubleshooting Guide Training (Video - Released 4.30.2012)
2012 Samsung Top Load Washer Training (Video - Released 4.30.2012)
2012 Induction Range Training (Video - Released 04.30.2012)
These classes are essential to maintaining your skill set on 2012 Appliance products. Stay on the top of your game. Attend an on-line class today!
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